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Income Taxes Components of Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets    
Net operating loss carryforward $ 49,096us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 61,212us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and development credits 33,484us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 33,484us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Compensatory and other accruals 2,698us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 1,800us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Unrealized losses on investments 5,265us-gaap_DeferredTaxAssetsInvestments 0us-gaap_DeferredTaxAssetsInvestments
Intangible assets 819us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 0us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Foreign tax credits 201us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Other, net 3,725us-gaap_DeferredTaxAssetsOther 1,785us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets 95,288us-gaap_DeferredTaxAssetsGross 98,281us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Unremitted foreign earnings 0us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 7,001us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Unrealized gains on investments 0us-gaap_DeferredTaxLiabilitiesInvestments 3,704us-gaap_DeferredTaxLiabilitiesInvestments
Intangible assets 0us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 6,525us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Fixed assets 19,128us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 13,354us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Gross deferred tax liabilities 19,128us-gaap_DeferredIncomeTaxLiabilities 30,584us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset before valuation allowance 76,160sxcl_NetDeferredTaxAssetBeforeValuationAllowance 67,697sxcl_NetDeferredTaxAssetBeforeValuationAllowance
Valuation Allowance (78,018)us-gaap_DeferredTaxAssetsValuationAllowance (69,753)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax liability $ (1,858)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (2,056)us-gaap_DeferredTaxAssetsLiabilitiesNet